Alumina Tube

Alumina tube is a non-porous ceramic tube that is formed of 95%, 99%, or 99.8% alumna material. As a result of its remarkable thermal, mechanical, and chemical characteristics, it is a preferred option in various sectors. Its resistance to high temperatures, abrasion, and corrosion, as well as its ability to provide electrical insulation, make it an excellent material for a variety of applications. The versatility of alumina tube and its capability of being tailored to certain needs further increase its allure.

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Alumina tube is always the preferable option as protection tube and resistance tube. Due to its mechanical strength and wear resistance, it can maintain stable performance even in harsh environments. With years of experience, UNIPRETC offers a wide selection of alumina ceramic tube. Our customers place a high value on our high-quality manufacturing and machining technologies in the production of alumina tube.

Characteristics of Alumina Tube

Alumina tube has a number of unique characteristics that make it appropriate for a wide range of applications. The details are as follows:

- It has a Mohs hardness of 9, making it exceedingly hard and resistant to wear and abrasion.

- It is capable of withstanding temperatures of up to 1700 °C without suffering serious deformation or degradation.

- It is an excellent electrical insulator and can withstand high voltage.

- It offers a high bending strength and can withstand heavy loads without fracturing.

- It is chemically inert and highly corrosion-resistant against acids, alkalis, and other chemicals.

- It is capable of maintaining its dimensional stability over a wide temperature range.

- It is ideal for insulating electrical connections due to its high dielectric strength and low dielectric loss.

- Due to its high density, it can prevent gas or liquid leakage.

Customization of Alumina Tube

Alumina tube is primarily formed through slip casting, isostatic pressing, dry pressing, and extrusion. Different forming techniques are required for tubes with varying diameters, wall thicknesses, lengths, complex shapes, and precision requirements. Our technicians will select the most appropriate forming method based on the customer's drawings. After high-temperature sintering, diamond grinding technology will be employed to machine the tubes. The main machining equipment includes punch machine, centerless grinding, internal and external circular grinding, honing, and so forth.

Utilizations of Alumina Tubes

Great resilience to temperature

Alumina tubes are perfect for furnace tubes in high temperature furnaces, muffle furnaces and resistance furnaces since they can tolerate extremely high temperatures up to 1800 degrees Celsius. Alumina tubes in these uses guarantee constant temperature distribution inside the furnace and shield the materials inside from outside effects.

Insulation of electrical systems

Because of its great resistivity, alumina tubes are employed as electrical insulators in circuit boards, insulators, and other components that need electrical isolation in electrical and electronic equipment. Particularly crucial in high-frequency applications to guarantee the stability and dependability of signal transmission are the electrical insulating qualities of this material.

Chemical constancy

Because they resist corrosion well to most chemicals, alumina tubes are appropriate for the chemical industry's transportation of corrosive substances like acids, alkalis, and organic solvents. Furthermore, the corrosion resistance of alumina tubes makes them the perfect material for piping systems and chemical equipment.

The resilience to wear

Alumina tubes are ideal for parts of pumps and valves since of their great hardness, particularly in fluid systems containing abrasive particles. By extending the equipment's service life, this wear resistance lowers maintenance expenses.

Airtightness

For situations when sealing protection is needed, including pressure vessels and reactors, they can offer good sealing performance to stop the leaking of gas or liquid.

High load-related softening point

That implies that even under heavy loads, alumina tubes can keep their shape and structure. Alumina tubes work well in applications carrying heavier loads because of this characteristic, such high-temperature load-bearing components and mechanical support systems.

Application of alumina tubes

The great temperature and corrosion resistance of alumina tubes in industrial applications are well known. In high-temperature furnaces, they find extensive application as furnace tubes to shield the inside materials from physical and chemical harm. Alumina tubes find frequent application in chemical vapor deposition and diffusion procedures during the semiconductor production process. Their chemical stability and great thermal resistance guarantee the exact course of the process.

Corrosion-resistant alumina tubes are perfect for transporting corrosive chemicals in the chemical sector. They are frequently used in pumps, valves, and reactor components, where they can resist erosion by acids, alkalis, and organic solvents, therefore lowering material wear and maintenance expenses.

The electrical industry places equal weight on the electrical insulating qualities of alumina tubes. As insulation, they shield wires from the outside world and guarantee the dependability and safety of electricity transmission.

Furthermore, the industries of manufacturing and machining employ alumina tubes because of their great hardness and wear resistance. Their extended life and stability shield mechanical systems, and they are utilized to create wear-resistant components like bearings, seals, and cutting tools.

Alumina tubes are a perfect material for the production of aircraft and spacecraft components in the aerospace industry because of their high strength and light weight qualities. They lighten the construction while yet offering the necessary mechanical characteristics and heat resistance in certain applications.

Electrical Insulator

In high-voltage applications, alumina ceramic tube are frequently utilized as electrical insulators. They are perfect for insulators in electrical systems and devices due to their excellent dielectric characteristics and high electrical resistivity.

Thermocouple Protection Sheath

Alumina tube can also be utilized as thermocouple protection sheaths. These tubes enable precise temperature measurements in high-temperature situations while offering thermal insulation and mechanical protection to the sensitive thermocouple wires.

Furnace Tubes

In furnaces and kilns, alumina ceramic tubes are employed because of their outstanding thermal stability. They are useful for applications including heat treatment, sintering, and firing procedures because they can resist high temperatures without deforming or degrading.

Semiconcutor Chamber and Liner

Equipment for semiconductor deposition, etching, and thermal treatment uses high purity alumina tube as chambers, liners, and insulating parts.

Corona Treater Tube

The alumina tube used as a corona treater needs to be engineered to withstand the application's particular electrical and thermal demands. To fit the desired voltage and corona discharge, it should have proper size and electrical characteristics.

Alumina tube is composed of 95%, 99%, or 99.8% alumina. The purity of a tube determines its quality, and the resistance increases with increasing purity. But accordingly, the higher the purity, the higher the cost. You can inform us of your specific usage environment and requirements, and our technicians will recommend suitable materials for you based on relevant material parameters.

FAQ About Alumina Tube

Q: How hard is it to machine alumina?

A: Alumina can be machined in three different states: green, biscuit, and fully dense. When it is in the green or biscuit state, it can be machined into intricate geometries relatively simply. Nevertheless, the sintering process required to completely densify the material causes the alumina body to contract by about 20%.

Q: Does alumina tube come in various sizes and shapes?

A: Yes, depending on the manufacturer and application, alumina tube is available in a wide range of sizes, from small diameters to large dimensions. It comes in a variety of forms like square tubes, round tubes, and custom-designed configurations.

Q: Can alumina tube be used in vacuum applications?

A: Yes, because of its excellent high-temperature resistance and low outgassing characteristics, alumina tube is frequently employed in vacuum applications. It is essential to choose a proper grade of alumina tube that satisfies the demands of the particular vacuum system.

Q: What are the disadvantages of alumina tube?

A; Since it is brittle by nature, mechanical stress or impact can cause it to crack or fracture. Additionally, it is susceptible to thermal shock, and uneven thermal expansion might result in cracking. Although alumina is a great electrical insulator in general, certain impurities or processing conditions may result in a certain degree of electrical conductivity.

Q: How is alumina tube manufactured?

A: Alumina tube is produced through several procedures. It typically begins with the production of alumina powder. After that, binders and additives are combined with the powder to generate a homogeneous material. The tube is sintered at high temperatures after being shaped into the desired form to obtain its final ceramic characteristics.